While Response, similar to Integrity, has many good qualities that you will want in different situations, Im not as sold on this card making the cut for Boros Aggro
(It's an artifact with ": Add
Shroud only protects a creature from spells or abilities targeting it
Legendary Creature - Human Rogue Villain Gix, Yawgmoth Praetor Whenever a creature deals combat damage to one of your opponents, its controller may pay 1 life
One note on condition: Japanese Charizard cards from modern sets generally ship closer to mint than their English counterparts because JPN packaging uses tighter pack-liner tolerances, but centering remains the single biggest grading-risk factor
And since the Clone is a legendary Deadpool, after you've had your Clone Deadpool exchange its text box with a creature, the legend rule will apply and will make you get rid of one of the Deadpools